New from @salkhanacademy on systems of equations -- he outwits a bridge troll and then helps the King plan a party.http://www.khanacademy.org/about/blog/post/34711826884/trolls-kings-and-solving-systems-of-equations …
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New from @salkhanacademy on systems of equations -- he outwits a bridge troll and then helps the King plan a party.http://www.khanacademy.org/about/blog/post/34711826884/trolls-kings-and-solving-systems-of-equations …
